Electric motor.



` F. LLSESSIONS.

ELECTRIC MOTOR.

APrLIoATIoN FILED Amma, 190e.

yPatented Juvly 26, 1910.

K GEK/Gf I.

y .f y, M

a closedbox containing the o -FRANxLfsEssIoNs or CoLUMgeUs, oHIo, Assrenon, nr

JEFFREY MANUFACTURING COMPANY, A CURPQRATION 0F OHI ELECTRIC' Moron.

To all 'whom it may concern:

Be it known that I, FRANK L. SESSIONS, a citizen of the United States, residing at Columbus, in the county ofFranklin and lState of Ohio, have invented certain new and useful Improvements in Electric `Motors, o 4which the following is a specification, referarted when it is necessary to obtain access to the parts in the' interior of the box.

Figure 1 is a longitudinal central section of a motor embodying my improvements. Fig. 2 is a transverse section on the line 2-2 of Fig. l. Fig. 3 is a transversel section showing the top of the field removed and the .interior'parts in the positions occupied when they are to be removed from the lower field sections; Fig. 4 showsthe armature and the removable field magnets suspended from the lifting devices; and' Figs. 5, 6, and 7 are detail views of one of the clamping plates; and Fig. 8 is a side view of one of the wrought plates or laminae of which the pole pieces are composed.

The motor .shown in the drawings is oonstructed with the following parts: A is the armature shaft to which are secured the armature C, and the commutator D. As concerns the details of these they may be of any known o r preferred type. The armatrre shaft is mounted in' bearing platesv E, t', itssupportin bearings being indicated bye, e. The fie d has the peripheral part or field frame indicated by B, this being approximately quadrangularin cross section. t is formed in two parts b, b, t-hatis an upper half and a lower half which are separable on a plane of division the axis of the armature. The bearing plates E and E in which the shaft is vmounted are fitted to apertures in the ends ofthe eld, and when the field sections b, b and the plates E, E' are secured together they form era'tive parts of the motor. When the fiel is separated land the armature removed, asY hereinafter described, the bearings E-E are bodily re- Speoication ef Letters atent. Patented Application led August 23, 1806. Serial No. 331,781.

. movable, with the armature,

'ield coils.

lsecuredl by bolts K and clampingl passing through Jury ae, aero.

from the aper-I Masten ASSIGNMENTS, 'ro 'rn tures in which they fit, 'as shown in dotted lines in Fig. l. The field B supports four field magnets H, H, H', H.

Heretofore it has been the practice to remove the armatureendwise or axially from the field; or` to divide the lield diagonally between the poles; or to divide fboth the field and one or more poles, the latter being consequent poles without coils. For important reasons it is desirable4 that the plane of division 4of the field should be transverse to two of the poles and` their coils. The division of the field diagonally` is inconvenient in manufacture and 1n snbsequent manipulation, and it is desirable for' compactness, y that the vertical distance from the armature axis to the exterior of the bottom of the field be as short as possible. And for the best results in action, all of the poles should have .An important object ofthe presentinvention is to divide the field most advantageously for manufacture, yfor compactness, and for repair, which involves a sepa ration of the field on a plane transverse to one or more of the eld'coils; and to enable this object to be practically realized by proper arrangement and attachment, relative to the field, of the field coil or Coils which thus 'oross the said plane of separaand low mounting of a motor,

enl

tion. Ordinarily such plane of sepa-ration is horizontal, and such aconstruetion is illustrated, wherein H, H indicate the upperild wer vertically arranged magnets and 7 3 The core parts or pole pieces ofV the magnets H-H are shown at It?, and their field coils at N. These 4cores andfcoils, so far as the present invention is concerned, may be se- Cured to the field frame permanently or in any desired mannenbut l have shown them plates J,- the form'of fastening devices w ich l' use to secure the pole pieces and 'coils of the side magnets HL-H in position.'A Theield frame is formed with plane surfaces or seats G against which thepole pieces and coils are clamped, the coils being backed byplates I.l When the upper and lower'sectio'ns of.

the lield are separated from each other, the pole pieces and coils of the magnets'H-H need' not be disturbed.` The side magnets H-H, however, are situated so that ltheir pole pieces h 'and coils It are bisectedhrby the plane of division of the -field sections and,

as the ti s Il? of thepole pieces partially embrace t e armature, 1t is impossible to remove the armature laterally or radially (asl distinguished from endivise or axially) un less provision is made for removing the pole the poles h and coils h firmly in position and, at the same time, permit their ready removal. The clam ing plates J are approximately Z-shapeil and each has one of its end sections formed .with a socket to receive the nutvJ of bolt K. rThe 'face j of this end section is beveled or inclined so that only the rounded corner yx bears against the lip of the pole piece.l The opposite end section of the plate has a rounded face j adapted tobear against the inner surface of the coils 7L The clamping plate is drawn tovplace by means of the bolt K,- which passes through the lip of the pole piece and through the wall of the field with its head K on the outside. By turning the bolt its .nut J', being held against rotation in its socket, is made to exert pressure on the clamping plate which in turn transmits the pressure to the pole piece and coil. The bottom of the `socket of nut J', is crowned or otherwise formed so that the clamp J is free to vrock somewhat, as the pole piece and coil arebeingpforced intol position. rl.`hus the plate J 1s in effect a lever which serves to divide the pull of bolt K between the pole piece and coil in the desired ratio.

As many ofthe clamps J may be used as are found necessary to .properly hold; the coils and pole pieces. As shown there is one at the upper side and one at the lower side of the pole, each being held by a bolt K, as'described. l

A motor. having its parts constructed and arranged 1n the way which has been set forth can be readily taken apart by following steps wlnch will be readily understood y from an inspection of the drawings and the i" above description.

p i The upper section b of v.thewfield 1s first released from the lower secation by withdrawing the bolts vat B which.

Lyfa'sten them together. Then it is elevated iafter the upper bolts K of the lateral mag-V nets are withdrawn. This leaves in the lower section of the field the armature, the shaft, the end bearings E, E, the bottom field fmagnet and the two-side magnets H', `H. remove `all of these except the bottom magnet H the lifting band L is passed aroundthe armature and the two ends of the band secured to a lifting hook L. Then the yoke M is secured to each of the field magnets H', this yoke straddlingthe armature and havinga leg for each eld magnet. Itcanbe secured to the latter by bolts in the apertures which normally receive the bolts K. The yoke M can be connected'to armature band or cable of a lifting crane.` Then, the lower the same liftin device which supports the gL, as for instance the chain bolts K ofthe side magnets having been -removed, upon the application of power to the lifting devices, the .band Lraises the armature, and, simultaneously, the yoke M pulls up the two side magnets H', H, the

latter being free to move upward across the Y are placed ingproper position with relation to the armature and are supported by the yoke M. The armature is supported by the band L and the three parts (the two field magnets, and the armature, shaft and bear.

ing plates 1E, E) are lowered into proper position in the field frame, after which the upper section of the field is again lowered and bolted. i

I do not herein claim the lifting devices which are shown for assembling anddis'- assembling the motor, as these devices constitute the subjectfmatter of myco-pending application,Serial No. 525,356, filed October 29, 1909.

`What I claim ist- 1. In a dynamo-electric machine, thecombination with an armature and a shaft, of a field frame divided into sections on a plane through the shaft, and a pair of .unit-ary pole `pieces secured to the field frame across its plane of separation, said pole pieces being removable' with' the armature across the plane of separation when thel sections of the separation, saidmagnets being removablel with the armature across the plane of sepa l ration when the sections of the eld frame r are apart.

'3. In a dynamo-electric machine, the combination with an armature and a shaft, of a field frame divided into sections on a plane vri through the-shaft, the eld magnets perma-Y nently secured to 'therespective frame sections, and the eld magnets secured yto the frame across its plane o termagnets being removable as units with' 'the armature across the planeof separation when the field sections are apart. .f

4. In a dynamo-electric machine, the combination of a eld frame divided into separable sections, a vunitary pole piece extending across the line of se aration of therame sections, and indepen ent nieans securing the pole piece to 'each of the frame sections.

5. In a dynamo-electric 'machine2 thecombination of a field frame divided into separable sections, a unitary poleI piece extending across the line of separation of the frame sections, and independent means extending tothe exterior of the field frame forv securing the pole pieceto each ofthe frame sections.

6.v In a dynamo-electric machine'2 the combination of a ield frame divided into sepa.

l Yrable sections, a field magnet comprising a core and a coil extending across the line of. separatlon of the frame sections, and inde- .y

pendent means securing the pole .piece to each ofthe frame sections.

. 7. In -a dynamo-electric machine, the combination ,of a field frame' divided into separable sections, Y av field ,magnet comprising ya core anda coil extending across the-line of separation of the -franie sections, and inde'- endent means extendingto the exterior of t e eld frame for securingv the pole piece to each ofthe'frame sections; v

8. In a d name-electric machine,thecom bination o the field frame, the separable pole iece, field coils, clamping plates pivotally carino on the pole piece and bearing. on the field coils, and means for tightening hehciamping plates, substantiallyv as ,.set,

separationythe lat 9. In a d namo-,eletric machine, the'combination o the'eld frame, the` separablew pole piece, field coils, rocking clamping.;

plates bearing on the pole piecev and bearing i on the ieldcoils, and means A.extending through the pole piece for tightening the .clamping plates, substantially asset forth; 50

xrable eld magnet com rising a .coiland polepiece ia clamping p ate bearing at vone end upon the' ole piece and at the other end upon the 0011 andl the. bolt extending support on the polepisce and coil.

12. In a dyamoelectric machine, 'the 7b combination of "the .cld frame, the rotary' armature, the separable pole piece having circumferential extensions' adjacent the armature 'and projecting lips under saidl pole piece extensions, rocking clamping lates engaging said lips, and bolts extendingthroughthe frame and loosely engagingv v 'the plates to applyvthe clamping pressure thereto.l l

In testimony *whereof-.I aiiix my signature, 8o

in presence of'two witnesses.

, FRANK n snss'IoN's.

Witnesses: I l

LE. P. SNIVELY,

C. L. MCCQNKEY;

. '68 through. the field frame ,and loosely engag- Y* -ing the clamping plate 'to apply the clamping pressure theretofbetween the points of 

